Solved: String was not recognized as a valid DateTime (Whe... - Power Platform Community
php - What is the easiest way to check if time is set in datetime variable - Stack Overflow
Solution: String was not recognized as a valid DateTime when calling DateTime.ParseExact on results of GetDetailsOf call | Jon Gallant
Validate Config showing "Failure" on "Updates" FAIL: DateTime::__construct(): Failed to parse time string (@) at position 0 (@): Unexpected character - Help - LibreNMS Community
format - Error :- String was not recognized as a valid DateTime - Stack Overflow
Solved: function to check valid date - Power Platform Community
20 Most Useful PHP Functions to Simplifying Date and Time Manipulation